Contactless power transmission device and power transfer system

Abstract

A power supply ECU executes transmission power control for controlling transmission power to target power by adjusting the duty of an output voltage of an inverter and turn-on current control for controlling a turn-on current to a target value by adjusting the drive frequency of the inverter. The target value for the turn-on current is set to fall within a range where a recovery current is not produced in a freewheel diode of the inverter. The power supply ECU executes each control such that a responsivity of the transmission power control becomes higher than that of the turn-on current control during the execution of startup processing of the inverter.

What is claimed is: 
     
         1 . A contactless power transmission device, comprising:
 a power transmission unit configured to transmit electric power to a power reception device in a contactless manner;   a voltage-source inverter configured to supply transmission power in accordance with a drive frequency to the power transmission unit; and   a control unit configured to control the inverter,   the control unit executing
 a first control for controlling the transmission power to target power by adjusting a duty of an output voltage of the inverter, and 
 a second control for controlling a turn-on current by adjusting the drive frequency, the turn-on current indicating an output current of the inverter at a rising of the output voltage, 
   the control unit executing the first and second controls such that a responsivity of the first control becomes higher than a responsivity of the second control during the execution of startup processing of the inverter.   
     
     
         2 . The contactless power transmission device according to  claim 1 , wherein the control unit makes a control gain of the first control higher than a control gain of the second control during the execution of the startup processing. 
     
     
         3 . The contactless power transmission device according to  claim 1 , wherein the control unit further executes the first and second controls such that the responsivity of the second control becomes higher than the responsivity of the first control during the execution of stop processing of the inverter. 
     
     
         4 . The contactless power transmission device according to  claim 3 , wherein the control unit makes a control gain of the second control higher than a control gain of the first control during the execution of the stop processing. 
     
     
         5 . The contactless power transmission device according to  claim 1 , wherein the control unit executes the first and second controls such that the responsivity of the first control during the execution of the startup processing becomes higher than the responsivity of the first control during the execution of stop processing of the inverter. 
     
     
         6 . The contactless power transmission device according to  claim 5 , wherein the control unit makes a control gain of the first control during the execution of the startup processing higher than a control gain of the first control during the execution of the stop processing. 
     
     
         7 . The contactless power transmission device according to  claim 1 , wherein the control unit executes the first and second controls such that the responsivity of the second control during the execution of stop processing of the inverter becomes higher than the responsivity of the second control during the execution of the startup processing. 
     
     
         8 . The contactless power transmission device according to  claim 7 , wherein the control unit makes a control gain of the second control during the execution of the stop processing higher than a control gain of the second control during the execution of the startup processing. 
     
     
         9 . A power transfer system, comprising:
 a power transmission device; and   a power reception device,   the power transmission device including
 a power transmission unit configured to transmit electric power to the power reception device in a contactless manner, 
 a voltage-source inverter configured to supply transmission power in accordance with a drive frequency to the power transmission unit, and 
 a control unit configured to control the inverter, the control unit executing 
 a first control for controlling the transmission power to target power by adjusting a duty of an output voltage of the inverter, and 
 a second control for controlling a turn-on current to a target value by adjusting the drive frequency, the turn-on current indicating an output current of the inverter at a rising of the output voltage, 
   the target value being set to fall within a range where a recovery current is not produced in a freewheel diode of the inverter,   the control unit executing the first and second controls such that a responsivity of the first control becomes higher than a responsivity of the second control during the execution of startup processing of the inverter.   
     
     
         10 . The power transfer system according to  claim 9 , wherein the control unit further executes the first and second controls such that the responsivity of the second control becomes higher than the responsivity of the first control during the execution of stop processing of the inverter. 
     
     
         11 . The power transfer system according to  claim 9 , wherein the control unit executes the first and second controls such that the responsivity of the first control during the execution of the startup processing becomes higher than the responsivity of the first control during the execution of stop processing of the inverter. 
     
     
         12 . The power transfer system according to  claim 9 , wherein the control unit executes the first and second controls such that the responsivity of the second control during the execution of stop processing of the inverter becomes higher than the responsivity of the second control during the execution of the startup processing.